<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>浮动布局</title>
    <style>
        .fu {
            background-color: #ff0;
            overflow: hidden;
            width: 500px;
        }

        .fu > div {
            width: 100px;
            height: 100px;
            border: 3px solid #f00;
        }

        .z1 {
            background-color: #f00;
            float: right;
        }

        .z2 {
            background-color: #0f0;
            float: right;
        }

        .z3 {
            background-color: #00f;
            float: right;
        }
    </style>
</head>
<body>
<div class="fu">
    <div class="z1"></div>
    <div class="z2"></div>
    <div class="z3"></div>
</div>
</body>
</html>